mars.mips.instructions.syscalls
Class SyscallRead
java.lang.Object
mars.mips.instructions.syscalls.AbstractSyscall
mars.mips.instructions.syscalls.SyscallRead
- All Implemented Interfaces:
- Syscall
public class SyscallRead
- extends AbstractSyscall
Service to read from file descriptor given in $a0. $a1 specifies buffer
and $a2 specifies length. Number of characters read is returned in $v0.
(this was changed from $a0 in MARS 3.7 for SPIM compatibility. The table
in COD erroneously shows $a0). *
Constructor Summary |
SyscallRead()
Build an instance of the Read file syscall. |
Method Summary |
void |
simulate(ProgramStatement statement)
Performs syscall function to read from file descriptor given in $a0. |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
SyscallRead
public SyscallRead()
- Build an instance of the Read file syscall. Default service number
is 14 and name is "Read".
simulate
public void simulate(ProgramStatement statement)
throws ProcessingException
- Performs syscall function to read from file descriptor given in $a0. $a1 specifies buffer
and $a2 specifies length. Number of characters read is returned in $v0 (starting MARS 3.7).
- Specified by:
simulate
in interface Syscall
- Specified by:
simulate
in class AbstractSyscall
- Parameters:
statement
- ProgramStatement object for this syscall instruction.
- Throws:
ProcessingException